Energy-Efficient Peak-Current State-Machine Control With a Peak Power Mode
Energy-Efficient Peak-Current State-Machine Control With a Peak Power Mode
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DOI：
10.1109/tpel.2008.2005412
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发表时间：
2009-02
影响因子：
6.7
通讯作者：
K. Wong
中科院分区：
文献类型：
--
作者：
K. Wong
本文建模的峰值电流控制是一种新型的变频控制，它通过启用和禁用周期而不是调制脉宽来保持反激变换器的调节，这允许消除反馈补偿，并且可以提供比额定满负荷功率高三倍的峰值功率，而不增加电源组件的尺寸。状态机根据负载需求设置每个启用周期的峰值电流。该控制方案的变频特性大大降低了轻负载下的开关损耗，同时状态机降低峰值电流减少了变压器的输出纹波和可听激励。状态机控制首次完全建模，包括对连续传导模式（CCM）下可输出的最大功率、状态间的峰值电流比、稳定所需的状态数、稳定所需的状态转换的最小计数的新建模，以及对具有最大开关频率两倍的新峰值状态的建模，该状态在短暂的峰值负载期间提供峰值功率，而不需要高估变压器。提供了围绕使用该控制方案的单片集成电路设计的电源的特性。
The peak-current control that is modeled in this paper is a novel variable-frequency control that maintains regulation in a flyback converter by enabling and disabling cycles instead of modulating the pulse width, which allows for elimination of feedback compensation and can provide for peak power three times higher than the rated full-load power without increasing the power supply component sizes. A state machine sets the peak current of each enabled cycle, based on the load requirements. The variable-frequency nature of this control scheme reduces switching losses significantly at light loads, while the lowering of the peak current by the state machine reduces the output ripple and audible excitations of the transformer. The state-machine control is completely modeled for the first time, including new modeling for the maximum power deliverable in continuous conduction mode (CCM), the peak-current ratio between states, the number of states required for stability, the minimum number of counts for state transitions required for stability, and modeling for a new peak state with double the maximum switching frequency, which provides peak power during brief peak loads, without requiring an overrated transformer . Characterization of a supply that was designed around the monolithic IC that uses this control scheme is provided.